package chapter05.e16;

import java.util.Random;

public class E16 {
    public static void main(String[] args) {
        //数学方法类 Math
        System.out.println(Math.random());
        System.out.println(Math.PI);
        //随机数类 Random
        Random r=new Random();
        for(int i=0;i<10;i++){
            System.out.println(r.nextInt(54));
        }
        //
        Integer num=1;
        Character c='a';
        int d=num;
    }
}
